Move Doctrine Support to a separate companion library

[visto9259]

Context:

LmcRbacMvc provide a role provider based on Doctrine ORM which forces to add dependencies to Doctrine for all application, even the ones that are not using Doctrine ORM.
It would be better to have a separate companion library just for the ORM based Role provider

Work to do:

• Remove Doctrine ORM Role Provided from LmcRbacMvc
• Create a companion library called LmcRbacMvcDoctrine
• Update documentation

[visto9259]

Doctrine is widely used.
This enhancement is probably not required and add minimal overhead, other than having to manage dependencies which would need to done anyway.
Won't do.